this is a very complicated cocktail of biology, environment and psychology, and it's not a behavioral choice. >> let me play devil's advocate here, and you say nobody chooses to be overweight. >> or anorexic. >> many people say it's the lifestyle choices and the food choices that you make. you are very much in the public spotlight and what are your thoughts on this? >> i definitely think that you absolutely -- i agree with you, doctor, you cannot choose to be obese. you don't choose to be anorexic. it just seems to be people think you probably sit at home and eat tons of food or sit at home and don't eat anything at all and that's a choice, but it's beyond that. >> not just in the news media, and let's take chris christie as an example, a figure who has been publicly criticized about his figure and weight, and he is very overweight and he knows it and admits it and he addressed this issue time and again, and even discussing it with piers morgan. >> i struggle with my weight. i have been struggling a long time with it and i know it would be better for my kids if i got it more under con